String.LastIndexOfAny Method (Char(), Int32, Int32)

Reports the zero-based index position of the last occurrence in this instance of one or more characters specified in a Unicode array. The search starts at a specified character position and proceeds backward toward the beginning of the string for a specified number of character positions.

This method begins searching at the startIndex character position of this instance and proceeds backward toward the beginning until either a character in anyOf is found or count character positions have been examined. The search is case-sensitive.

This method performs an ordinal (culture-insensitive) search, where a character is considered equivalent to another character only if their Unicode scalar values are the same. To perform a culture-sensitive search, use the CompareInfo.LastIndexOf method, where a Unicode scalar value representing a precomposed character, such as the ligature "Æ" (U+00C6), might be considered equivalent to any occurrence of the character's components in the correct sequence, such as "AE" (U+0041, U+0045), depending on the culture.

' Sample for String.LastIndexOfAny(Char[], Int32, Int32)Imports System
_
Class Sample
PublicSharedSub Main()
Dim br1 AsString = "0----+----1----+----2----+----3----+----4----+----5----+----6----+-"Dim br2 AsString = "0123456789012345678901234567890123456789012345678901234567890123456"Dim str AsString = "Now is the time for all good men to come to the aid of their party."Dim start AsIntegerDim at AsIntegerDimcountAsIntegerDim target AsString = "aid"Dim anyOf AsChar() = target.ToCharArray()
start =(str.Length - 1) * 2 / 3
count =(str.Length - 1) / 3
Console.WriteLine("The last character occurrence from position {0} for {1} characters.", start, count)
Console.WriteLine("{1}{0}{2}{0}{3}{0}", Environment.NewLine, br1, br2, str)
Console.Write("A character in '{0}' occurs at position: ", target)
at = str.LastIndexOfAny(anyOf, start, count)
If at > - 1 Then
Console.Write(at)
Else
Console.Write("(not found)")
EndIf
Console.Write("{0}{0}{0}", Environment.NewLine)
EndSub'MainEndClass'Sample''This example produces the following results:'The last character occurrence from position 44 for 22 characters.'0----+----1----+----2----+----3----+----4----+----5----+----6----+-'0123456789012345678901234567890123456789012345678901234567890123456'Now is the time for all good men to come to the aid of their party.''A character in 'aid' occurs at position: 27'